Builder mechanism



July 11, 1944. E. HAGGER'UI'Y ET AL BUILDER MECHANISM Filed Dec. 30, 1942 2 Sheets-Sheet 1,

raz/ Eye es,

y 1944- E. HAGGERTY ET AL 2,353,330

BUILDER MECHANISM Filed Dec, 30, 1942 2 Sheets-Sheet 2 Patented July 11, 194-4 UNETED STATES i ATENT OFFIUF.

BUILDER MECHANISM Appiicat icn December 30, 1942, Serial No. 470,598

2 Claims.

This invention relatesto builder mechanism as commonly used in spinning or twisting machines to control the winding of the yarn and the shaping of the bobbins. Such control is commonly exercised by changing either the length or the locus of the yarn'traverse relative to the bobbin.

.For. certain purposes, it is desirable to produce bobbins of large diameter and having a substantial taper at both the top and the bottom ends of the yarn winding. It is also essential that the yarn be so laid that the windings will always .come off singly from the ends of the bobbins and not in bunches.

It is the general object of our invention to provide improved builder mechanism. by which such a double taper winding may be conveniently attained.

A further object is to provide mechanism by which this result may 'be. accomplished through i the shifting of the locus of the yarn traverse, while maintaining the length thereof substantially constant. In the preferred construction, the locus of the winding is gradually and oppositely shifted, first toward one end of the bobbin, and then toward the other.

A preferred form of our invention is shown in the drawings, in which Fig. 1 is a plan View of our improved builder mechanism;

Fig. 2 is a side elevation, looking in the direction of the arrow 2 in Fig. 1;

Fig. 3 is an end view, looking in the direction of the arrow 3 in Fig. 2;

Fig. 4 is a partial plan view of an auxiliary builder lever;

Fig. 5 is a partial plan view of a main builder lever and certain associated parts;

Fig. 6 is a detail front elevation, partly in section, along the line 6-6 in Fig. 5 and showing a, friction brake device; and

Fig. 7 is a front view of a bobbin as fashioned by our improved builder mechanism.

Referring to the drawings, our improved builder mechanism comprises a main builder lever ill and an auxiliary builder lever ll, both pivotally mounted on a short shaft [2 which is supported in a fixed bearing bracket M. The bracket I4 may be clamped to the frame of the spinning or twisting machine, or may be independently supported on a separate fioor stand, as may be most convenient.

The main builder lever It has an offset projection H5 in which a cam roll I! is rotatably mounted on a stud It. The cam roll I! is in continuous engagement with the usual heart cam or builder cam 20, shown in Fig. 3 but omitted in Figs. 1 and 2 for the sake of clearness.

The usual outline and position of this heart cam is clearly shown in the prior patent to Hargreaves, No. 1,984,641, issued to applicant's assignees December 18, 1934.

A feed shaft 22 extends lengthwise of the main builder lever l0 and is rotatably supported in suitable bearings therein. A worm 24 is mounted on the shaft 22 and engages a worm gear 26, rotatable on a stud 21 fixed in an upwardly projecting portion 28 of the main lever 10. An auxiliary cam 30 is mounted on the outer end of the shaft 21, to rotate with the worm gear 26. The cam 30 engages an auxiliary cam roll 32, rotatably mounted in a recessed portion of the auxiliary lever H (Fig. i).

A plurality of studs (Fig. l) are mounted in the lever ll near its free or swinging end, and a builder chain 42 (Fig. 2) may be attached to any one of the studs lil. By providing a plurality of studs, several different yarn traverse lengths may be obtained from the same main builder or heart cam. A friction brake device (Fig. 6) is preferably provided at the inner end of the feed shaft 22, and friction is applied thereto by a compression spring 5|.

A ratchet wheel is mounted on the front end of the feed shaft 22, and a compound feed lever (Fig. 3) is mounted to swing about the axis of the shaft 22. Spring-pressed feed pawls 6| and 62 are mounted on the two arms of the feed lever 60, which arms are relatively adjustable so that the fed pawls BI and 62 may be relatively set for half-tooth feed if so desired.

A feed rod 1!] is pivoted at H to one arm of the feed lever 60 and extends upward through a fixed frame member (2. The travel of the rod relative to the fixed member 12 is limited by adjustable upper and-lower stop collars l4 and 15.

As the main builder lever swings upward and downward under the control of the builder cam 20, the feed pawls 6! and 62 will be moved clockwise and backward on a return or idle movement as the builder lever moves downward, and will be forced forward or anti-clockwise in a feeding movement as the builder lever swings upward. The extent of the ratchet feed may be adjustably determined by the setting of the stop collars 14 and 75.

The construction and operation of the ratchet feed, and the connection of the builder chain 42 to the vertically movable spindle rail or ring the cam 30 will be shifted only very slightly for each swinging movement of the main builder lever l0 and for each vertical traverse of the yarn relative to the bobbin. The change in the relative positions of the main builder lever I0 and the auxiliary lever II is therefore so slight at each reciprocation of the levers that the traverse of the yarn on the bobbin is substantially constant and is directly controlled by the contour of the main builder or heart cam 210.

Gradual rotation of the auxiliary cam 30, however, effects a slow shifting of theauxiliary lever H relative to the main builder lever it, and this slow shifting effects a corresponding shifting of the locus of the yarn traverse on thebobbin.

By varying the contour of the auxiliary cam 36, the shape of the finished bobbin may be changed within wide limits.

A usual type of bobbin is shown in Fig. 7, in

which the finished bobbin is tapered at both the upper and lower ends, and in which the yarn ,package has an over-all length of eight inches while the yarn traverse is shown as about six inches. This involves a two inch shifting of the locus of yarn traverse under the control of the auxiliary cam 30.

By varying the throw and contour of the cam 39, different desired shapes of yarn packages may be readily attained, and by shifting the builder chain 42 from one to the other of the studslll], a longer orshorter yarn traverse may be produced by the same main builder or heart cam. 7

It will be noted that all parts of our improved builder lever are of simple and rugged construction and that there is very little about the builder mechanism which can possibly get out of order or cause trouble. Furthermore, the auxiliary cam 30, being on the outer end of the shaft 21, can be readily removed and replaced by a different cam whenever this becomes necessary or advisable.

Having thus described our invention and the advantages thereof, we do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what we claim is:

1. In a builder mechanism, a main builder lever, an auxiliary builder lever to which a builder chain is connected, said main and auxiliary levers being mounted on a common axis, a main builder cam constantly rotated to give said main builder lever swinging movements of fixed arc and said auxiliary lever being correspondingly swung by and with said main lever, an auxiliary cam rotatably mounted on said main builder lever and effective to give said auxiliary lever an additional swinging movement, a feed shaft rotatably mounted on said main lever and extending longitudinally thereof, a brake device for said feed shaft, a worm and worm gear connection between said feed shaft and said aux- ROBERT HARGREAVESQ' I 

